Integrated Ionic-Additive Assisted Wet-Spinning of Highly Conductive and Stretchable PEDOT:PSS Fiber for Fibrous Organic Electrochemical Transistors

As one of the most prevalently used conductive polymers, poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS) has been studied for many years. Recently, especially with the development of smart clothing and wearable devices, PEDOT:PSS fiber is becoming the focus of researchers. However, the undesirable conductivity and stretchability hinder its applications. In this work, an integrated ionic-additive assisted wet-spinning strategy (IIAWS) is demonstrated to address the existing bottlenecks. The fabricated fiber exhibited an extremely high conductivity of 3573 S cm(-1) and stretchability of about 30%. The mechanisms for conductivity enhancement in the entire preparation process are systematically studied and clarified. Furthermore, an all-solid-state fibrous organic electrochemical transistor (OECT) device based on the PEDOT:PSS fiber is fabricated with a transconductance of 2.44 mS and impressive bending property.